Fatal error: Uncaught Error: Class 'Yoast\WP\SEO\Integrations\Admin\Background_Indexing_Integration' not found in /var/www/wp-content/plugins/wordpress-seo/src/loader.php:228 Stack trace: #0 /var/www/wp-content/plugins/wordpress-seo/src/loader.php(197): Yoast\WP\SEO\Loader->conditionals_are_met('Yoast\\WP\\SEO\\In...') #1 /var/www/wp-includes/class-wp-hook.php(292): Yoast\WP\SEO\Loader->load_integrations('') #2 /var/www/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters(NULL, Array) #3 /var/www/wp-includes/plugin.php(484): WP_Hook->do_action(Array) #4 /var/www/wp-settings.php(560): do_action('init') #5 /var/www/wp-config.php(107): require_once('/var/www/wp-set...') #6 /var/www/wp-load.php(37): require_once('/var/www/wp-con...') #7 /var/www/wp-blog-header.php(13): require_once('/var/www/wp-loa...') #8 /var/www/index.php(17): require('/var/www/wp-blo...') #9 {main} thrown in /var/www/wp-content/plugins/wordpress-seo/src/loader.php on line 228